Some good sites in Singpore

National Library Board -(NLB Singapore)
http://m.nlb.gov.sg/
we can search for the book available and even can reserve it.
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India Airport Customs ( Import & Export )

I find this is very useful to read before taking the flight to india.
As per the custom rule the goods market price is based on the actual price which we buy, it is not the india price as some officer ask (mainly to bribe ;) ) ,refer the answer no 24 in FAQ.

http://www.cbec.gov.in/travellers.htm
http://www.cbec.gov.in/customs/cs-act/formatted-htmls/cs-rulef.htm
http://www.cbec.gov.in/faq.htm
http://www.cbec.gov.in/exchange-rate-idx.htm
http://www.xe.com/

Have a nice journey dude ;)
buy as much as possible for your loved ones in India....